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Hi I'm Brian and I'm here to help!
Can you finish your last sentence for me please? "When this happens it seems that my...." Also, can you give me the model number of your Infinity equipment please? (furnace or air handler and outdoor unit)
The most likely cause of this is the outdoor air sensor on your outdoor unit. It could be oxidized wire connections in that sensor circuit so you should check that. I know the sensor(s) for the outdoor unit are available online, it will take some searching though. I believe the outdoor unit sensors (2) come as a set and both need replaced for that particular model. I'm going by memory though so I may be mistaken. I'll have more info on the sensor(s) soon.
Click Here for the thermistor assembly. The part number is ***** 319182-701. This part is getting really hard to find! If you replace this assembly and you still get the alarm occasionally then chances are good your outdoor unit control board is at issue.
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